/*******************************************************************************
 * Copyright (c) 2012-2015 Codenvy, S.A.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   Codenvy, S.A. - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.core;


import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaElementDelta;
import org.eclipse.jdt.core.IProblemRequestor;
import org.eclipse.jdt.core.JavaModelException;

/**
 * Switch and ICompilationUnit to working copy mode
 * and signal the working copy addition through a delta.
 */
public class BecomeWorkingCopyOperation extends JavaModelOperation {

    IProblemRequestor problemRequestor;

    /*
     * Creates a BecomeWorkingCopyOperation for the given working copy.
     * perOwnerWorkingCopies map is not null if the working copy is a shared working copy.
     */
    public BecomeWorkingCopyOperation(CompilationUnit workingCopy, IProblemRequestor problemRequestor) {
        super(new IJavaElement[]{workingCopy});
        this.problemRequestor = problemRequestor;
    }

    protected void executeOperation() throws JavaModelException {

        // open the working copy now to ensure contents are that of the current state of this element
        CompilationUnit workingCopy = getWorkingCopy();
        JavaModelManager.getJavaModelManager()
                .getPerWorkingCopyInfo(workingCopy, true/*create if needed*/, true/*record usage*/, this.problemRequestor);
        workingCopy.openWhenClosed(workingCopy.createElementInfo(), true, this.progressMonitor);

        if (!workingCopy.isPrimary()) {
            // report added java delta for a non-primary working copy
            JavaElementDelta delta = new JavaElementDelta(getJavaModel());
            delta.added(workingCopy);
            addDelta(delta);
        } else {
//            if (workingCopy.getResource().isAccessible()) {
                // report a F_PRIMARY_WORKING_COPY change delta for a primary working copy
                JavaElementDelta delta = new JavaElementDelta(getJavaModel());
                delta.changed(workingCopy, IJavaElementDelta.F_PRIMARY_WORKING_COPY);
                addDelta(delta);
//            } else {
//                // report an ADDED delta
//                JavaElementDelta delta = new JavaElementDelta(getJavaModel());
//                delta.added(workingCopy, IJavaElementDelta.F_PRIMARY_WORKING_COPY);
//                addDelta(delta);
//            }
        }

        this.resultElements = new IJavaElement[]{workingCopy};
    }

    /*
     * Returns the working copy this operation is working on.
     */
    protected CompilationUnit getWorkingCopy() {
        return (CompilationUnit)getElementToProcess();
    }

    /*
     * @see JavaModelOperation#isReadOnly
     */
    public boolean isReadOnly() {
        return true;
    }

}
